The zoom animations everywhere on the new iOS 7 are literally making me nauseous and giving me a headache. It's exactly how I used to get car sick if I tried to read in the car.

Another adds:

I have the same problem. After using it for two minutes, I felt nauseous. It's the same way I feel when I use spaces on my Mac.

In more severe cases, iDevice users have had to go home sick from work after using iOS 7, while others have "lost the rest of the day to [the mobile OS]" after falling ill.
It is possible to disable parallax in iOS 7, and this can be done in the Settings app: Touch "General," then "Accessibility," and "Reduce Motion." However, though this should tone down parallax, there's no way to disable the "zooming" effects in iOS 7 entirely; Apple support has said as much, according to a number of forum posts, though it could be that this may change with a future version of the mobile OS.
Apple has yet to comment on the matter officially, however we'll update this article if we hear anything.
Have you suffered from motion sickness after using iOS 7?
See also: Apple Confirms The Schedule For Its iOS 7 "Tech Talks" International Tour, Help Me Fly Makes You Look At Toy Planes In A New Light, and How Not To Make A Game For The App Store.